hvirtual/plugins/freeverb/Components/revmodel.cpp

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// Reverb model implementation
//
// Written by Jezar at Dreampoint, June 2000
// http://www.dreampoint.co.uk
// This code is public domain

#include "revmodel.hpp"

revmodel::revmodel()
{
        // Tie the components to their buffers
        combL[0].setbuffer(bufcombL1,combtuningL1);
        combR[0].setbuffer(bufcombR1,combtuningR1);
        combL[1].setbuffer(bufcombL2,combtuningL2);
        combR[1].setbuffer(bufcombR2,combtuningR2);
        combL[2].setbuffer(bufcombL3,combtuningL3);
        combR[2].setbuffer(bufcombR3,combtuningR3);
        combL[3].setbuffer(bufcombL4,combtuningL4);
        combR[3].setbuffer(bufcombR4,combtuningR4);
        combL[4].setbuffer(bufcombL5,combtuningL5);
        combR[4].setbuffer(bufcombR5,combtuningR5);
        combL[5].setbuffer(bufcombL6,combtuningL6);
        combR[5].setbuffer(bufcombR6,combtuningR6);
        combL[6].setbuffer(bufcombL7,combtuningL7);
        combR[6].setbuffer(bufcombR7,combtuningR7);
        combL[7].setbuffer(bufcombL8,combtuningL8);
        combR[7].setbuffer(bufcombR8,combtuningR8);
        allpassL[0].setbuffer(bufallpassL1,allpasstuningL1);
        allpassR[0].setbuffer(bufallpassR1,allpasstuningR1);
        allpassL[1].setbuffer(bufallpassL2,allpasstuningL2);
        allpassR[1].setbuffer(bufallpassR2,allpasstuningR2);
        allpassL[2].setbuffer(bufallpassL3,allpasstuningL3);
        allpassR[2].setbuffer(bufallpassR3,allpasstuningR3);
        allpassL[3].setbuffer(bufallpassL4,allpasstuningL4);
        allpassR[3].setbuffer(bufallpassR4,allpasstuningR4);

        // Set default values
        allpassL[0].setfeedback(0.5f);
        allpassR[0].setfeedback(0.5f);
        allpassL[1].setfeedback(0.5f);
        allpassR[1].setfeedback(0.5f);
        allpassL[2].setfeedback(0.5f);
        allpassR[2].setfeedback(0.5f);
        allpassL[3].setfeedback(0.5f);
        allpassR[3].setfeedback(0.5f);
        setwet(initialwet);
        setroomsize(initialroom);
        setdry(initialdry);
        setdamp(initialdamp);
        setwidth(initialwidth);
        setmode(initialmode);

        // Buffer will be full of rubbish - so we MUST mute them
        mute();
}

void revmodel::mute()
{
        if (getmode() >= freezemode)
                return;

        for (int i=0;i<numcombs;i++)
        {
                combL[i].mute();
                combR[i].mute();
        }
        for (int i=0;i<numallpasses;i++)
        {
                allpassL[i].mute();
                allpassR[i].mute();
        }
}

void revmodel::processreplace(float *inputL, float *inputR, float *outputL, float *outputR, long numsamples, int skip)
{
        float outL,outR,input;

        while(numsamples-- > 0)
        {
                outL = outR = 0;
                input = (*inputL + *inputR) * gain;

                // Accumulate comb filters in parallel
                for(int i=0; i<numcombs; i++)
                {
                        outL += combL[i].process(input);
                        outR += combR[i].process(input);
                }

                // Feed through allpasses in series
                for(int i=0; i<numallpasses; i++)
                {
                        outL = allpassL[i].process(outL);
                        outR = allpassR[i].process(outR);
                }

                // Calculate output REPLACING anything already there
                *outputL = outL*wet1 + outR*wet2 + *inputL*dry;
                *outputR = outR*wet1 + outL*wet2 + *inputR*dry;

                // Increment sample pointers, allowing for interleave (if any)
                inputL += skip;
                inputR += skip;
                outputL += skip;
                outputR += skip;
        }
}

void revmodel::processmix(float *inputL, float *inputR, float *outputL, float *outputR, long numsamples, int skip)
{
        float outL,outR,input;

        while(numsamples-- > 0)
        {
                outL = outR = 0;
                input = (*inputL + *inputR) * gain;

                // Accumulate comb filters in parallel
                for(int i=0; i<numcombs; i++)
                {
                        outL += combL[i].process(input);
                        outR += combR[i].process(input);
                }

                // Feed through allpasses in series
                for(int i=0; i<numallpasses; i++)
                {
                        outL = allpassL[i].process(outL);
                        outR = allpassR[i].process(outR);
                }

                // Calculate output MIXING with anything already there
                *outputL += outL*wet1 + outR*wet2 + *inputL*dry;
                *outputR += outR*wet1 + outL*wet2 + *inputR*dry;

                // Increment sample pointers, allowing for interleave (if any)
                inputL += skip;
                inputR += skip;
                outputL += skip;
                outputR += skip;
        }
}

void revmodel::update()
{
// Recalculate internal values after parameter change

        int i;

        wet1 = wet*(width/2 + 0.5f);
        wet2 = wet*((1-width)/2);

        if (mode >= freezemode)
        {
                roomsize1 = 1;
                damp1 = 0;
                gain = muted;
        }
        else
        {
                roomsize1 = roomsize;
                damp1 = damp;
                gain = fixedgain;
        }

        for(i=0; i<numcombs; i++)
        {
                combL[i].setfeedback(roomsize1);
                combR[i].setfeedback(roomsize1);
        }

        for(i=0; i<numcombs; i++)
        {
                combL[i].setdamp(damp1);
                combR[i].setdamp(damp1);
        }
}

// The following get/set functions are not inlined, because
// speed is never an issue when calling them, and also
// because as you develop the reverb model, you may
// wish to take dynamic action when they are called.

void revmodel::setroomsize(float value)
{
        roomsize = (value*scaleroom) + offsetroom;
        update();
}

float revmodel::getroomsize()
{
        return (roomsize-offsetroom)/scaleroom;
}

void revmodel::setdamp(float value)
{
        damp = value*scaledamp;
        update();
}

float revmodel::getdamp()
{
        return damp/scaledamp;
}

void revmodel::setwet(float value)
{
        wet = value*scalewet;
        update();
}

float revmodel::getwet()
{
        return wet/scalewet;
}

void revmodel::setdry(float value)
{
        dry = value*scaledry;
}

float revmodel::getdry()
{
        return dry/scaledry;
}

void revmodel::setwidth(float value)
{
        width = value;
        update();
}

float revmodel::getwidth()
{
        return width;
}

void revmodel::setmode(float value)
{
        mode = value;
        update();
}

float revmodel::getmode()
{
        if (mode >= freezemode)
                return 1;
        else
                return 0;
}

//ends

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